SB20260720443 - Improper access control in Linux kernel ntfs3

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Main Vulnerability Database SB20260720443

SB20260720443 - Improper access control in Linux kernel ntfs3

Published: July 20, 2026

Security Bulletin ID SB20260720443
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-63833)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to improper access control in the ntfs3 xattr handler when handling direct userspace writes to reserved $LX* extended attributes. A local user can set crafted $LXUID, $LXGID, $LXMOD, or $LXDEV values on a file they own to escalate privileges.

Exploitation requires a writable ntfs3 mount and relies on inode reload of WSL permission metadata into inode ownership and mode fields.


Remediation

Install update from vendor's website.

References